CSS warning - Same colors for color and background-color in two contexts

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CSS warning - Same colors for color and background-color in two contexts

Code:

Same colors for color and background-color in two contexts #sliding_cart and .ui-datepicker-links

I get around 200 of these warnings or similar using the w3c CSS validator. I was just wondering why, when I'm pretty sure the elements don't cross over each other i.e the text is not being hidden from users. I thought thats what Google et al crapped their pants about.

Should I be concerned about these warnings and try to fix them? Both for CSS and Google SEO reasons.

The validator assumes that if, for a reason or another, that image will not be visible, the browser will provide a white background by default. To avoid this, you should simply set a certain background color as well(the most appropriate with your image, if you want to)